NSH SFC/Build, install, and test images

1. Build A VPP Package

Please follow below link to build a VPP image:

 https://wiki.fd.io/view/VPP/Build,_install,_and_test_images

2. Clone Code and Build NSH_SFC Plugin

Step 1: Clone Code

 git clone https://gerrit.fd.io/r/nsh_sfc

Step 2: Build NSH_SFC Plugin

 cd nsh_sfc/nsh-plugin/
 rm -fr build
 ./build.sh